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Valorisation of citrus processing waste: A review.
D A Zema1, P S Calabrò2, A Folino1
1Department AGRARIA, Università Mediterranea di Reggio Calabria, loc. Feo di Vito, 89122 Reggio Calabria, Italy.
Citrus peel waste (CPW) presents disposal challenges but offers valuable compounds for food, cosmetic, and pharmaceutical industries. Further research is needed to overcome economic and technical hurdles for sustainable CPW valorisation.
Area of Science:
- Agricultural Science
- Biotechnology
- Environmental Science
Background:
- Citrus peel waste (CPW) is a major byproduct of citrus processing, posing economic and environmental disposal challenges.
- CPW is characterized by seasonal production, high water content, and essential oils, complicating storage and utilization.
- Current uses include animal feed and soil conditioning, but these are limited by proximity and land availability.
Purpose of the Study:
- To analyze the quantitative and qualitative characteristics of citrus peel waste.
- To discuss and evaluate various systems for the valorisation of citrus peel waste.
- To explore the potential for high-value compound recovery and alternative energy production from CPW.
Main Methods:
- Literature review and analysis of existing studies on citrus peel waste characteristics and valorisation technologies.
- Assessment of current and potential applications, including animal feed, soil conditioning, biomethane/bioethanol production, and extraction of high-value compounds.
- Evaluation of economic sustainability and technical challenges associated with different valorisation pathways.
Main Results:
- CPW has significant potential for valorisation due to its nutritional and chemical composition.
- Promising applications include the production of pectin, dietary fibers, flavonoids, flavorings, citric acid, biomethane, and bioethanol.
- Existing valorisation methods face challenges such as seasonal availability, high water content, and the inhibitory effects of essential oils on microbial processes.
Conclusions:
- Citrus peel waste valorisation offers promising avenues for resource recovery and waste reduction.
- Economic viability and overcoming technical barriers, particularly those related to essential oils, are critical for widespread adoption.
- Further research and technological development are necessary to unlock the full potential of CPW in various industrial sectors.
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